• SpringData系列一 Spring Data的环境搭建


      本节作为主要讲解Spring Data的环境搭建

    • JPA Spring Data :致力于减少数据访问层(DAO)的开发量。开发者唯一要做的就是声明持久层的接口,其他都交给Spring Data JPA来帮你完成!
    • 使用Spring Data JPA进行持久层开发需要的四个步骤:
    1. 配置Spring 整合 JPA
    2. 在Spring配置文件中配置Spring Data,让Spring 为声明的接口创建代理对象。配置了<jpa:repositories>后,Spring 初始化容器时将会扫描base-package 指定的包目录及其子目录,为继承Repository或其子接口的接口创建代理对象,并将代理对象注册为SpringBean,业务层便可以通过Spring的自动封装的特性来直接使用该对象。
    3. 声明持久层的接口,该接口继承Repository。Repository是一个标记型接口,它不包含任何方法,如必要,Spring Data 可实现Repository其他子接口,其中定义了一些常用的增删改查,以及分页相关的方法。
    4. 在接口中声明需要的方法。Spring Data将根据给定的策略,来为其生成实现代码。
    • 环境搭建

       1.所需要的包

        ① 加入spring包

          spring-aop-4.3.8.RELEASE.jar
          spring-aspects-4.3.8.RELEASE.jar
          spring-beans-4.3.8.RELEASE.jar
          spring-context-4.3.8.RELEASE.jar
          spring-core-4.3.8.RELEASE.jar
          spring-expression-4.3.8.RELEASE.jar
          spring-jdbc-4.3.8.RELEASE.jar
          spring-orm-4.3.8.RELEASE.jar
          spring-tx-4.3.8.RELEASE.jar
          spring-web-4.3.8.RELEASE.jar
          spring-webmvc-4.3.8.RELEASE.jar
          com.springsource.net.sf.cglib-2.2.0.jar
          com.springsource.org.aopalliance-1.0.0.jar
          com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
          commons-logging-1.1.1.jar
        ② 加入hibernate包
          antlr-2.7.7.jar
          dom4j-1.6.1.jar
          hibernate-commons-annotations-4.0.5.Final.jar
          hibernate-core-4.3.11.Final.jar
          hibernate-jpa-2.1-api-1.0.0.Final.jar
          jandex-1.1.0.Final.jar
          javassist-3.18.1-GA.jar
          jboss-logging-3.1.3.GA.jar
          jboss-logging-annotations-1.2.0.Beta1.jar
          jboss-transaction-api_1.2_spec-1.0.0.Final.jar
        ③ 加jpa的包
          hibernate-entitymanager-4.3.11.Final.jar
        ④ 加c3p0的包
          c3p0-0.9.2.1.jar
          hibernate-c3p0-4.3.11.Final.jar
          mchange-commons-java-0.2.3.4.jar
        ⑤ 加mysql的驱动
          mysql-connector-java-5.1.7-bin.jar
        ⑥加入springData 
          spring-data-commons-1.6.2.RELEASE.jar
          spring-data-jpa-1.4.2.RELEASE.jar
        ⑦加入 slf4j-api-1.6.1.jar

      2.Spring Bean配置文件

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <beans xmlns="http://www.springframework.org/schema/beans"
     3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
     4     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
     5     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
     6         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
     7         http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
     8         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
     9     <context:property-placeholder location="classpath:db.properties" />
    10     <!--配置数据源 -->
    11     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    12         <property name="user" value="${jdbc.user}"></property>
    13         <property name="password" value="${jdbc.password}"></property>
    14         <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
    15         <property name="driverClass" value="${jdbc.driverClass}"></property>
    16     </bean>
    17     <!--配置JPA的entityManagerFactory -->
    18     <bean id="entityManagerFactory"
    19         class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    20         <property name="dataSource" ref="dataSource"></property>
    21         <!-- 配置JPA的实现 -->
    22         <property name="jpaVendorAdapter">
    23             <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean>
    24         </property>
    25         <property name="packagesToScan" value="com.ntjr.springdata"></property>
    26         <property name="jpaProperties">
    27             <props>
    28                 <!-- 二级缓存相关 -->
    29                 <!-- <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop> 
    30                     <prop key="net.sf.ehcache.configurationResourceName">ehcache-hibernate.xml</prop> -->
    31                 <!-- 生成的数据表的列的映射策略 -->
    32                 <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
    33                 <!-- hibernate 基本属性 -->
    34                 <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
    35                 <prop key="hibernate.show_sql">true</prop>
    36                 <prop key="hibernate.format_sql">true</prop>
    37                 <prop key="hibernate.hbm2ddl.auto">update</prop>
    38             </props>
    39         </property>
    40     </bean>
    41     <!--配置事物管理器 -->
    42     <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    43         <property name="entityManagerFactory" ref="entityManagerFactory"></property>
    44     </bean>
    45     <!-- 配置支持注解的事物 -->
    46     <tx:annotation-driven transaction-manager="transactionManager" />
    47     <!--配置springData -->
    48     <!--base-package:扫描Repository Bean所在的package -->
    49     <jpa:repositories base-package="com.ntjr.springdata"
    50         entity-manager-factory-ref="entityManagerFactory"
    51         transaction-manager-ref="transactionManager">
    52     </jpa:repositories>
    53 </beans>
    applicationContext.xml

      3.数据库持久类

     1 package com.ntjr.springdata;
     2 
     3 import java.util.Date;
     4 
     5 import javax.persistence.Column;
     6 import javax.persistence.Entity;
     7 import javax.persistence.GeneratedValue;
     8 import javax.persistence.Id;
     9 import javax.persistence.Table;
    10 
    11 @Table(name = "JPA_PERSONS")
    12 @Entity
    13 public class Person {
    14 
    15     private Integer id;
    16     private String lastName;
    17 
    18     private String email;
    19     private Date birth;
    20 
    21     @GeneratedValue
    22     @Id
    23     public Integer getId() {
    24         return id;
    25     }
    26 
    27     public void setId(Integer id) {
    28         this.id = id;
    29     }
    30 
    31     public String getLastName() {
    32         return lastName;
    33     }
    34 
    35     @Column(name = "LAST_NAME")
    36     public void setLastName(String lastName) {
    37         this.lastName = lastName;
    38     }
    39 
    40     public String getEmail() {
    41         return email;
    42     }
    43 
    44     public void setEmail(String email) {
    45         this.email = email;
    46     }
    47 
    48     public Date getBirth() {
    49         return birth;
    50     }
    51 
    52     public void setBirth(Date birth) {
    53         this.birth = birth;
    54     }
    55 
    56     @Override
    57     public String toString() {
    58         return "Person [id=" + id + ", lastName=" + lastName + ", email=" + email + ", birth=" + birth + "]";
    59     }
    60     
    61 
    62 }
    Person.java

      4.DAO

     1 package com.ntjr.springdata;
     2 
     3 import org.springframework.data.repository.Repository;
     4 
     5 /**
     6  * 
     7  * 1、实现Repository接口 
     8  * 2、通过注解的方式@RepositoryDefinition将一个bean定义为Repository接口
     9  */
    10 public interface PersonRepsitory extends Repository<Person, Integer> {
    11     // 根据lastName获取对应的person
    12     Person getByLastName(String lastName);
    13 }
    PersonRepository.java

      5.测试

     1 package com.ntjr.springdata.test;
     2 
     3 import org.junit.Test;
     4 import org.springframework.context.ApplicationContext;
     5 import org.springframework.context.support.ClassPathXmlApplicationContext;
     6 
     7 import com.ntjr.springdata.Person;
     8 import com.ntjr.springdata.PersonRepsitory;
     9 
    10 public class SpringDataTest {
    11 
    12     private ApplicationContext ctx = null;
    13     {
    14         ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    15     }
    16 
    17     @Test
    18     public void getPersonForLastName() {
    19         PersonRepsitory personRepsitory = ctx.getBean(PersonRepsitory.class);
    20         Person person = personRepsitory.getByLastName("AA");
    21         System.out.println(person);
    22     }
    23 
    24 
    25 
    26 }
    SpringDataTest.java

     

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  • 原文地址:https://www.cnblogs.com/zhaobingqing/p/6854322.html
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